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MILITARY TEN CAP t�D - <br /> BLASTING MACHINE C "°"T°' <br /> II. too C 24.2,:ppr <br /> • a0ka,,rnow, <br /> Arsnel ' Arsnel I i SO <br /> Rebuilt Rebuilt <br /> ,00 <br /> O.D. • <br /> green, -� Ex. cond. inside, <br /> excellent la <br /> condition ` ,� used cond. out- oe o S x <br /> 1-year ��,� side, 6 mos. 6•. b . ; ■ <br /> warranty. <br /> 0 t • 1 I is <br /> warranty. $� 00 o ,no„'°"` 4vaaliCN..m <br /> $2900 Figure 8. Circumferential strain and surface <br /> vertical vibration <br /> I1 U 1 J pipeline separations. By contrast, the previous stud• <br /> O 0 O 0 ics involved close-in "point" sources. Interesting is <br /> the apparent limiting effect of pipeline responses. <br /> Igniter Time 0 O Circumferential strains, in particular,do not continue <br /> Blasting ime d to increase in proportion to increasing surface parti- <br /> u.s. G) Blasting cle velocity. This could be from lack of total cou. <br /> Weatherproof, M60, Cap Container piing with the ground. <br /> once tired Durabu Wutk,O.D.jraen, <br /> $795 nobs io caps. Another possibility is that the spatially extended <br /> Waal'goo cond._84,95 charge with its relatively long detonation time <br /> uaaeia a:.cond..'9.95 impacts the pipeline less than a point source type <br /> blast. The hypothesis requires further analysis. <br /> -fir ROCK ISLAND ARMORY Stresses <br /> 25144 Ridge Road,Dept.EE,canna i 6 4 Stresses were calculated for each blast using max- <br /> . <br /> ' 1 inhum circumferential and longitudinal strains <br /> (309)441 214 • Fax:(309)4414758 <br /> (tablc4). As with previous SwRI studies by Esparza, <br /> these were assumed to be principle plane strains, <br /> tsD.--....---T and represent a type of worst case(as in pseudo vec- <br /> tor sum compared to true vector sum). Esparza's val. <br /> I :D6- - ues of Young's modulus (29.5 x 10°) and Poisson's <br /> o .', Ratio (0.3) were used (Ref 5). Stress values calculat• <br /> 166 : °' <br /> I <br /> POW _ ed from these tests are based on pseudo sums of ion- <br /> i;itudunal and circumferential. An initial examination <br /> 100- - of time-correlated strain components found that <br /> ,6. , peaks did not occur at the same time. Phase is also <br /> ° s, : ; <br /> ! e - important in calculating the stresses corresponding <br /> D6 to given strain states. If the two component are <br /> i0 " to opposite (one tensile and one comprehensive at any <br /> 00,,,,o,,,o040.4.0".4..10.' instanO, the calculated stresses are actually less than <br /> Figure 6. Cir czcrfzfer•ential strain and surface would correspond to either uniaxial strain. <br /> radial vibration Circumferential of hoop stresses from internal <br /> pressurization can be easily calculated from the <br /> thin-walled cylinder equation; <br /> t:6 <br /> • Lino <br /> 100 a 114441 <br /> I a Z°I.T ZDD+ 0 tZ.lr p,H[W <br /> • 1t4,cn MO <br /> 100 o tam„ <br /> 1tO- <br /> jIOO_ <br /> • <br /> 36 gs 0o I I0. ; • - • . <br /> e o . <br /> 0o j • g• 0 • a B• <br /> 10 is =6 06 r I , <br /> I +o <br /> cron une*, 1.w� <br /> w v,° <br /> ammo,,OMTgN,VEOTICAL hi <br /> Figure 7. Longitudinal strain and radial Figure 9. Longitudinal strain and surface <br /> vibration vertical vibration <br />